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      <p class="mytitle">Streamgraph</p>
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        <a href="#definition">definition</a> - <a href="#mistake">mistake</a> -
        <a href="#related">related</a> -
        <a href="#code">code</a>
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              <div class="mycontent">
<div id="definition" class="section level1">
<h1>Definition</h1>
<hr />
<p>A Stream graph is a type of <a
href="https://www.data-to-viz.com/graph/stackedarea.html">stacked area
chart</a>. It displays the evolution of a numeric value (Y axis)
following another numeric value (X axis). This evolution is represented
for several groups, all with a distinct color.</p>
<p>Contrary to a stacked area, there is no corner: edges are rounded
what gives this nice impression of flow. Moreover, areas are usually
displaced around a central axis, resulting in a flowing and organic
shape.</p>
<p><br></p>
<p>The following example shows the evolution of baby name frequencies in
the US between 1880 and 2015.</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="co"># Libraries</span></span>
<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a><span class="fu">library</span>(tidyverse)</span>
<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a><span class="fu">library</span>(babynames)</span>
<span id="cb1-4"><a href="#cb1-4" tabindex="-1"></a><span class="fu">library</span>(streamgraph)</span>
<span id="cb1-5"><a href="#cb1-5" tabindex="-1"></a></span>
<span id="cb1-6"><a href="#cb1-6" tabindex="-1"></a></span>
<span id="cb1-7"><a href="#cb1-7" tabindex="-1"></a><span class="co"># Load dataset from github</span></span>
<span id="cb1-8"><a href="#cb1-8" tabindex="-1"></a>data <span class="ot">&lt;-</span> babynames <span class="sc">%&gt;%</span></span>
<span id="cb1-9"><a href="#cb1-9" tabindex="-1"></a>  <span class="fu">filter</span>(name <span class="sc">%in%</span> <span class="fu">c</span>(<span class="st">&quot;Ashley&quot;</span>, <span class="st">&quot;Amanda&quot;</span>, <span class="st">&quot;Jessica&quot;</span>,    <span class="st">&quot;Patricia&quot;</span>, <span class="st">&quot;Linda&quot;</span>, <span class="st">&quot;Deborah&quot;</span>,   <span class="st">&quot;Dorothy&quot;</span>, <span class="st">&quot;Betty&quot;</span>, <span class="st">&quot;Helen&quot;</span>)) <span class="sc">%&gt;%</span></span>
<span id="cb1-10"><a href="#cb1-10" tabindex="-1"></a>  <span class="fu">filter</span>(sex<span class="sc">==</span><span class="st">&quot;F&quot;</span>)</span>
<span id="cb1-11"><a href="#cb1-11" tabindex="-1"></a></span>
<span id="cb1-12"><a href="#cb1-12" tabindex="-1"></a><span class="co"># Plot</span></span>
<span id="cb1-13"><a href="#cb1-13" tabindex="-1"></a>data <span class="sc">%&gt;%</span></span>
<span id="cb1-14"><a href="#cb1-14" tabindex="-1"></a>  <span class="fu">streamgraph</span>(<span class="at">key=</span><span class="st">&quot;name&quot;</span>, <span class="at">value=</span><span class="st">&quot;n&quot;</span>, <span class="at">date=</span><span class="st">&quot;year&quot;</span>) <span class="sc">%&gt;%</span></span>
<span id="cb1-15"><a href="#cb1-15" tabindex="-1"></a>  <span class="fu">sg_fill_brewer</span>(<span class="st">&quot;BuPu&quot;</span>)</span></code></pre></div>
<div id="htmlwidget-997ab825451e757f14da" class="streamgraph html-widget" style="width:960px;height:288px;"></div>
<div id="htmlwidget-997ab825451e757f14da-legend" style="width:960" class="streamgraph html-widget-legend"><center><label style='padding-right:5px' for='htmlwidget-997ab825451e757f14da-select'></label><select id='htmlwidget-997ab825451e757f14da-select' style='visibility:hidden;'></select></center></div>
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<p><em>Note</em>: The dataset is available through the <a
href="https://github.com/hadley/babynames">babynames</a> R library and a
<code>.csv</code> version is available on <a
href="https://github.com/holtzy/data_to_viz/tree/master/Example_dataset">github</a>.</p>
</div>
<div id="what-for" class="section level1">
<h1>What for</h1>
<hr />
<p>Streamchart are good to study the <code>relative proportions</code>
of the whole. However they are bad to study the evolution of each
<code>individual group</code>: it is very hard to substract the height
of other groups at each time point. For a more accurate but less
attractive figure, consider a <a
href="https://www.data-to-viz.com/graph/line.html">line chart</a> or <a
href="https://www.data-to-viz.com/graph/area.html">area chart</a> using
small multiple.</p>
<p>Stream chart gets really useful when displayed in an interactive
mode: highlighting a group gives you directly an insight of its
evolution.</p>
</div>
<div id="variation" class="section level1">
<h1>Variation</h1>
<hr />
<p>Even if areas are usually displaced around a central axis, it is
possible to display them as for most of the chart type: over the 0
axis.</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" tabindex="-1"></a><span class="co"># Plot</span></span>
<span id="cb2-2"><a href="#cb2-2" tabindex="-1"></a>data <span class="sc">%&gt;%</span></span>
<span id="cb2-3"><a href="#cb2-3" tabindex="-1"></a>  <span class="fu">streamgraph</span>(<span class="at">key=</span><span class="st">&quot;name&quot;</span>, <span class="at">value=</span><span class="st">&quot;n&quot;</span>, <span class="at">date=</span><span class="st">&quot;year&quot;</span>, <span class="at">offset=</span><span class="st">&quot;zero&quot;</span>) <span class="sc">%&gt;%</span></span>
<span id="cb2-4"><a href="#cb2-4" tabindex="-1"></a>  <span class="fu">sg_fill_brewer</span>(<span class="st">&quot;BuPu&quot;</span>)</span></code></pre></div>
<div id="htmlwidget-cf3cc317b5ff41b91325" class="streamgraph html-widget" style="width:960px;height:288px;"></div>
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<p><br><br></p>
<p>It also possible to create a percent streamchart where the proportion
of each group is displayed instead of its absolute value. Here, the
total number of baby names is not available anymore. However, the most
popular names at each period gets more obvious.</p>
<div class="sourceCode" id="cb3"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1" tabindex="-1"></a><span class="co"># Plot</span></span>
<span id="cb3-2"><a href="#cb3-2" tabindex="-1"></a>data <span class="sc">%&gt;%</span></span>
<span id="cb3-3"><a href="#cb3-3" tabindex="-1"></a>  <span class="fu">streamgraph</span>(<span class="at">key=</span><span class="st">&quot;name&quot;</span>, <span class="at">value=</span><span class="st">&quot;n&quot;</span>, <span class="at">date=</span><span class="st">&quot;year&quot;</span>, <span class="at">offset=</span><span class="st">&quot;expand&quot;</span>) <span class="sc">%&gt;%</span></span>
<span id="cb3-4"><a href="#cb3-4" tabindex="-1"></a>  <span class="fu">sg_fill_brewer</span>(<span class="st">&quot;BuPu&quot;</span>)</span></code></pre></div>
<div id="htmlwidget-c534d3f56b258e37c8c2" class="streamgraph html-widget" style="width:960px;height:288px;"></div>
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</div>
<div id="mistake" class="section level1">
<h1>Common caveats</h1>
<hr />
<ul>
<li>In my opinion, streamgraph work well when there is a clear pattern
in the data. If the proportion of each group remain more or less the
same all along the time frame, the figure won’t be very insightfull
since small variations will be hard to read.</li>
</ul>
</div>
<div id="related" class="section level1">
<h1>Related</h1>
<hr />
<div class="row">
<div class="col-lg-3 col-md-6 col-sm-6">
<a href="https://www.data-to-viz.com/graph/line.html" class="btn btn-primary mybtnrelated" style="margin-bottom:4px;white-space: normal !important;">
<img  src="https://github.com/holtzy/data_to_viz/raw/master/img/section/LineSmall.png">
<p class="mytitlerelated">
Line plot
</p>
<p class="mytextrelated">
Displays the evolution of one or several numeric variables.
</p>
</a>
</div>
<div class="col-lg-3 col-md-6 col-sm-6">
<a href="https://www.data-to-viz.com/graph/area.html" class="btn btn-primary mybtnrelated" style="margin-bottom:4px;white-space: normal !important;">
<img  src="https://github.com/holtzy/data_to_viz/raw/master/img/section/AreaSmall.png">
<p class="mytitlerelated">
Area chart
</p>
<p class="mytextrelated">
Basically a line graph, filling the area under the curve.
</p>
</a>
</div>
<div class="col-lg-3 col-md-6 col-sm-6">
<a href="https://www.data-to-viz.com/graph/stackedarea.html" class="btn btn-primary mybtnrelated" style="margin-bottom:4px;white-space: normal !important;">
<img  src="https://github.com/holtzy/data_to_viz/raw/master/img/section/StackedAreaSmall.png">
<p class="mytitlerelated">
Stacked area chart
</p>
<p class="mytextrelated">
Displays the evolution of the value of several groups on the same
graphic
</p>
</a>
</div>
<div class="col-lg-3 col-md-6 col-sm-6">
<a href="https://www.data-to-viz.com/graph/streamgraph.html" class="btn btn-primary mybtnrelated" style="margin-bottom:4px;white-space: normal !important;">
<img  src="https://github.com/holtzy/data_to_viz/raw/master/img/section/StreamSmall.png">
<p class="mytitlerelated">
Streamgraph
</p>
<p class="mytextrelated">
A stacked area graph displaced around a central axis, resulting in a
flowing, organic shape
</p>
</a>
</div>
</div>
</div>
<div id="code" class="section level1">
<h1>Build your own</h1>
<hr />
<p>The <a href="https://www.r-graph-gallery.com/streamgraph.html">R</a>,
<a href="https://www.python-graph-gallery.com/streamchart/">Python</a>,
<a href="https://www.react-graph-gallery.com/streamchart">React</a> and
<a href="https://d3-graph-gallery.com/streamgraph.html">D3</a> graph
galleries are 4 websites providing hundreds of chart example, always
providing the reproducible code. Click the button below to see how to
build the chart you need with your favorite programing language.</p>
<p>
<a href="https://www.r-graph-gallery.com/streamgraph.html" class="btn btn-primary">R
graph gallery</a>
<a href="https://python-graph-gallery.com/streamchart/" class="btn btn-primary">Python
gallery</a>
<a href="https://www.react-graph-gallery.com/streamchart" class="btn btn-primary">React
gallery</a>
<a href="https://d3-graph-gallery.com/streamgraph.html" class="btn btn-primary">D3
gallery</a>
</p>
</div>
</div>

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                <h2 style="font-size: 44px" class="text-center">
                  Dataviz decision tree
                </h2>
                <p
                  class="text-center"
                  style="max-width: 600px; font-size: 18px"
                >
                  <a href="https://www.data-to-viz.com">Data To Viz</a> is a
                  comprehensive <b>classification of chart types</b> organized
                  by data input format. Get a high-resolution version of our
                  decision tree delivered to your inbox now!
                </p>
                <div
                  style="
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                    width: 100%;
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                  <script
                    async
                    data-uid="8010f15fd2"
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                    class="img-fluid"
                    src="../img/poster/poster_small.png"
                    alt="High Resolution Poster"
                    style="max-width: 400px"
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           &nbsp;
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<p style="text-align: center;">A work by <a href="https://www.yan-holtz.com/">Yan Holtz</a> for <a href="https://data-to-viz.com">data-to-viz.com</a></p>

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